# 请在下面补充你的代码
def fun(b,h):

    return(0.5*(b * h + h ** 2))
b = float(input())
h = float(input()) 
SA = fun(b,h)
c1 = int(SA/240)
print(f'弓形田地面积为{c1}亩零{SA-c1*240:.2f}平方步')
